You will need your 4 digit radio code. Sometimes you can find a sticker in the trunk next to your spare or in the glovebox. Otherwise you have to pull your radio for the serial number and call Audi for the code. I just used these instructions found on Fixya:Turn on radio - the word SAFE will appear in the
display. Press th P.SCAN and RBDS buttons simultaneously and hold them
down until "1000" lights up in the display.Release buttons.Do not, under
no circumtances, continue holding them down or press them once again.
This will cause the radio to consider the number 1000 to be the input
code.Use station buttons 1,2,3,and 4 to enter the code number on your
Radio Card. Use the button 1 to enter the first number 2 for the second
number 3 for the third number and 4 for the last number.Once you have
entered the code and it shows on the display,press the P.SCAN and RBDS
buttons down again simultaneously and hold them down until the word SAFE
appears in the display.Release buttons.You have three tries to enter the code correctly. If you do not, you will be locked out for at least an hour of car operation time. Good luck.

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Enter the radio code, take your car to the dealership with proof of ownership and they can get it for you, you should have it from the previous owner or if you bought it new, to enter it, hold the pscan and rbds buttons for a few seconds, then numbers will show up, press the corresponding buttons to change the numbers, when you have your code in, hold pscan and rbds buttons for a few seconds. when you release the radio should unlock, good luck

Get the code from your dealer with the car's VIN if the system is OEM.
Chances are the code is somewhere in the owners manual package that came with your car....so much for theft proofing...if you or the PO haven't removed it.
If you have the code, like 0095, you press and hold two buttons on the RHS of the Bose Symphoney II, the PSCAN and RBDS buttons IIRC for about 3-5 seconds...the SAFE should go out and 0000 appear on the screen.
You then use the first four program buttons to cycle each number (1 for first 0, 2 for second 0, etc.) to the program code. When you've entered the program code, press the PSCAN and RBDS buttons again to start the radio. I don't think the ignition has to be on.
Next time use a battery jumper...I prefer the portable kind that can be recharged through the power socket/lighter. I just replaced my battery ($153 genuine Audi OEM vice $300 installed) and had no issues with the radio. BTW, the auto up on the drivers and passenger windows probably has to be reset. Lower the window(s) all the way, raise them up and HOLD the switch up for 3 seconds...the auto up will reset.

P1411 - secondary air injection system flow too low Bank 2.
P1423 - secondary air injection system flow too low Bank 1.
Check vacuum hoses to combi valves ,
most common split air injection pump which is riveted with aluminum rivets,ck rivets if they coming out ,pump doesn't build enough pressure.
In this case take pump out and put bolts instead of rivets all around pump case.Repl. all rivets not only broken one.Bolts sold at HomeDepot , just find a needed size.

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IMPORTANT NOTE: You must have the security anti-theft code for your Audi radio from the car manufacturer, or from an Audi dealer! You can find the radio code at: http://www.radio-code.co.uk/

The sequence of programming for 2001 Audi A6 radio is: 1. Push simultaneous "SCAN" and "RDS" keys until on the screen will appear "1000" displayed. 2. Release keys. No more push on "SCAN" and "RDS" keys because otherwise number "1000" will be considered as first safe code attempt. For example: we have the security code "5079". Then: 3. By the no.# 1 key you will set up the first safe code digit. Push 5 times on the no.# 1 button. The "5" number will be setted. 4. By the no.# 2 key you will set up the second safe code digit. Push 10 times on the no.# 2 button. The "0" number will be setted. 5. By the no.# 3 key you will set up the third safe code digit. Push 7 times on the no.# 3 button. The "7" number will be setted. 6. By the no.# 4 key you will set up the four-th safe code digit. Push 9 times on the no.# 4 button. The "9" number will be setted. 7. Then push again simultaneous "SCAN" and "RDS" keys for confirm this safe code. On the screen will be displayed "SAFE" notice. Release keys! For few seconds a radio frequence will be displayed. The radio is now ready for use!

You will need the code to get it working. You may need Audi for this. Never disconnect the battery, or the alarm with trip on. Since it is frozen, I would try and remove the fuse, and reinstall it to reset the stereo. Then try the code.
I got lucky in my 2001 VW passat, when the stereo code was needed, but then the next day it started working by itself.